Malicious PDF — malware analysis report

Static analysis result for SHA-256 047109c16574cde9…

MALICIOUS

PDF

98.7 KB Created: 2021-08-10 02:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab4dcae558607fb2811d97cb862e3047 SHA-1: 7e704b595b46c28201ae15315d70a991c167cf00 SHA-256: 047109c16574cde9da3c193d3f57d9e0764a6337679eadfd21bf1f77c42722a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baohohoanglong.com/userfiles/file/51578320221.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/57481659596.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037425dea1---15494283718.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/vizolo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/waduzum.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/deziwivewepid.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/nolexijate.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076048bc06dc---60457146411.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/bimubi.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/rosafuzag.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/tqcil2m25bj9h1lnfp5rqnd0o7/19650591871.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d4aef8950c66718fd421ec43bb9a584b/10760447507.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/tuvijax.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b7761d6fbf4572c8e657ab0a37d53fa6/78236397575.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9q7jcona4563bgd8cs3hinls65/74097532891.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/93910638189.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/52133419935.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4428ab14f---zugifixemodidomora.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/dve1jrmtlr71r5qqgsbqlsmvi1/nefolagikutapagebudaweju.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ceabafbdcab679149af2600a81ba029b/xukaturilumoxopewanebe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3912c9d59f---suwedizafirenepitovunu.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/mejujupo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/c481g8tdt86hpclimqp5e27li3/rovejoborigojog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=recommendation+letter+sample+for+dental+assistantPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 10824 bytes
SHA-256: ce3a7cebb7f96964b8b48f5b08b0c0f561c2873d8e48921fe5addbe3c17b739a
font_01_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 17672 bytes
SHA-256: 7de2eb582071113f6bb360627da77bfe98cbe7ef805405b21c7f8e239795d2e2
font_02_sfnt_off000163ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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